Compilare: user.cpp: In function ‘int cer1(int)’: user.cpp:15:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<L[nod].size(); i++) ^ user.cpp:28:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:90:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<L[nod].size(); i++) ^